.left {
  width: 100%;
  height: 100%;
  background: #f4f4f4;
  overflow-x: hidden;
  font-size: 15px;
}

.left ul li {
  width: 80%;
  height: 40px;
  line-height: 40px;
  text-align: center;
  border-radius: 5px 5px 5px 5px;
}

.left ul a {
  text-decoration: none;
}

.left ul li:hover {
  background: #bfd4ef;
}
